Ok the thought is:
1) Bane has to be big.
2) Bane has to be speaking.
3) Bane is not stupid.
4) Bane has to be really big.
All these come into play while casting Bane. And I think the only way it can really be done is like this. Cast two actors. Body work and voice over. And who they would probably have to get a wrestler. Not Tyler Mane. Here are my choices for Bane:
: Yes he's a big [frick]er. Just throw the mask on him and let someone else do the talking.
: Yeah he's a WWE fan fav but I don't really know about his acting ability.
: He's big as hell and he's got some acting roles under his belt. Maybe Goldberg.
: A friend of mine told me to look this guy up and this [frick]er is big as hell but I don't know about his acting ability.
But like I said do the silver surfer thing. One actor for the body and another actor for the voice.